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ii8 ZYGNEMATACEAE<br />
Descriptions ok Species<br />
1. Temnogametum uleanum (Mobius) Wille 1909. Pflanzen-<br />
familien, 'Nachtrage zum 1 Teil, 2 abt., p. 13, Fig. 3.<br />
Mobius. Hedwigia. 34, p. 175, PI. 2, Figs. i-io. 1895.<br />
Vegetative cells io-12/x x 60-120/x, with an axile chromatophore<br />
with about 4 pyrenoids, cell sap purple; cells elongating to 20-25 diameters<br />
at time of conjugation; conjugation usually lateral, sometimes<br />
scalariform; gametangia 20-30 /a long; zygospores by lateral conjuga-<br />
tion obliquely ovoid, 20-40^1 x 40-60 /x; zygospores by scalariform con-<br />
jugation quadrangular with truncate angles, 25-40 ju. x 30-50 m; spore<br />
walls transparent and smooth. Aplanospores rare but present. (PI. XX,<br />
Figs. 1-4.)<br />
Brazil, near Itajahi, March, 1894 (E. Ule Coll.).<br />
2. Temnogametum heterosporum W. & G. S. West 1897. ]our.<br />
Bot. 35, p. 37, PL 370, Figs. 5-9.<br />
Vegetative cells i^-iyiJ- x 90-200^1; chromatophores with 2-6 pyre-<br />
noids, color of cell sap unknown; conjugation scalariform and lateral;<br />
gametangia 22-40 jw in length; zygospores by scalariform conjugation<br />
quadrangular with concave sides, 39-50 /a x 48-59 m; zygospores by lat-<br />
eral conjugation obliquely ovoid, 20-26 ^ x 61-67 ju spore wall smooth,<br />
transparent. (PI. XX, Fig. 10.)<br />
Africa, Angola, Morro de Lopollo, February, i860 (Welwitsch Coll.).<br />
3. Temnogametum transeaui Prescott 1947. Ohio Jour. Sci. 47,<br />
p. 132.<br />
Vegetative cells 14-20^ x 100-400^, with a narrow, axial chroma-<br />
tophore with 2-4 pyrenoids in a row; conjugation lateral and scalar-<br />
iform; gametangia, 20-22 m x 20-30;", at the ends of vegetative cells;<br />
zygospores by lateral conjugation obliquely ovoid, yu. 35-42 x 80-100 /x;<br />
zygospores by scalariform conjugation, iu, 40-50 x 45-60 /x; median wall<br />
smooth, orange-brown at maturity. (PI. XX, Figs. 5-6.)<br />
Ecuador, volcano Cotopaxi, hanging bog at 14,000 feet.<br />
4. Temnogametum thaxteri Transeau 1932. Ohio Jour. Sci. 32,<br />
p. 489, PI. I, Figs. 14-20.<br />
Vegetative cells 39-45 /^ x 220-360 m; chromatophore broad with<br />
30-120 pyrenoids scattered throughout; conjugation scalariform; gam-<br />
etangia 36-90 /x long; zygospores c|uadrangular-ovoid, 60-75;^ x 90-120 /u,<br />
occasionally in pairs which are somewhat longer and narrower; lateral<br />
walls concave; aplanospores tumid, about 60 m x 75 m- (PI- XX, Figs.<br />
7-9-)<br />
Trinidad, Cumuto Station, April 10, 1913 (Thaxter Coll.).<br />
The cell sap in this species is purple.